I have been having a stabbing/shock like pain in my left arm for about a week, Comes and goes. It is alarming when it happens. I am not a diabetic, on no medication etc. I am, however, 74 years old. Eat very healthy. I did have the shingles about 8 months ago and was wondering if it could be post shingle sympton possibly. doesn t seem like it though after all this time. I am worried, can you please give me some input. Thank you very much Also, pain is not on the same side that I had the shingles. Thanks again